Why does acidity increase with electronegativity

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Press ESC to cancel. Skip to content Home Physics Why does higher electronegativity increase acidity? Ben Davis September 2, Why does higher electronegativity increase acidity? How does size affect acidity? How do you determine which H is more acidic? How do you determine which is more acidic? Across a row in periodic table, acidity increases with the increase in electronegativity.

However, it is a weak acid and not a strong acid because it does not completely dissociate in water which is the definition of a strong acid or at least because the ions it forms upon dissociation are too strongly bound to each other for it to act as a strong acid.

Hydrofluoric acid HF is a weak acid mainly because it forms stable species after it dissociates. Hydrofluoric acid or HF is an extremely powerful, corrosive acid. HF aq is a very reactive, weak acid. The great attraction that fluorine has for most other atoms is the cause of HF aq being a weak acid.

This high attraction of fluorine for most other atoms gives rise to a very strong H—F bond that is not broken when HF dissolves in water. Intermolecular Forces HF is a polar molecule: dipole-dipole forces. Hydrogen is bounded to F. Hydrogen bonds exist. Moreover, the dipole moments increase as we move up the periodic table in the halogen group. We can conclude that fluorine atoms have a greater electronegativity than do chlorine atoms, etc.

Dipole-dipole forces are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule. They are much weaker than ionic or covalent bonds and have a significant effect only when the molecules involved are close together touching or almost touching.